High-Tc superconducting quantum interference filters (SQIFs) made by ion irradiation
High-Tc superconducting quantum interference filters (SQIFs) made by ion irradiation
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离子辐照制成的高温超导量子干涉滤光片（SQIF）
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
J. Lesueur
中科院分区：
文献类型：
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作者：
S. Ouanani;J. Kermorvant;C. Ulysse;M. Malnou;Y. Lemaître;B. Marcilhac;C. Feuillet;N. Bergeal;D. Crété;J. Lesueur
超导量子干涉滤波器（sqif）是由不同尺寸的超导环路阵列组成，其中包括约瑟夫森结（JJ）。对于尺寸的随机分布，它们对外加磁场表现出非周期性的响应，具有较大的传递函数和相对于单个SQUID可能提高的磁场灵敏度。这些特性使sqif成为探测微波频率电磁波磁性成分的有趣设备。我们在YBa2Cu3O7薄膜的基础上，采用高度可扩展的离子辐照技术制备了SQUIDs和sqif，并研究了它们的性能。两者都显示出最佳性能作为温度和偏置电流的函数，这可以在我们开发的数值模拟框架中理解。不对称和色散在JJ特性中的作用（在高Tc超导体技术中经常发现）也进行了研究。我们发现它们都不妨碍SQIF效应的存在，但它们都对最优点的出现起作用。我们最后给出了用2000个squid串联的SQIF的结果，显示了传递函数d V / d B ~ 1000 V / T。
Superconducting quantum interference filters (SQIFs) are arrays of superconducting loops of different sizes including Josephson junctions (JJ). For a random distribution of sizes, they present a non-periodic response to an applied magnetic field, with a large transfer function and a magnetic field sensitivity potentially improved with respect to that of a single SQUID. Such properties make SQIFs interesting devices to detect the magnetic component of electromagnetic waves at microwave frequencies. We have used the highly scalable technique of ion irradiation to make SQUIDs and SQIFs based on commercial YBa2Cu3O7 films, and studied their properties. Both display optimal performance as a function of temperature and bias current, that can be understood in the frame of numerical simulations that we developed. The role of asymmetries and dispersion in JJ characteristics (routinely found in high Tc superconductors technologies) is also studied. We have found that none of them impede the existence of a SQIF effect but both play a role on the emergence of the optimal point. We finally present results on SQIF made with 2000 SQUIDs in series, showing a transfer function d V / d B ∼ 1000 V / T .